Suspension mounting plate with cantilevered load beam support

ABSTRACT

Disk drive suspension including an actuator, a modified base mounting plate fixed to the actuator to support a load beam, flexure and slider assembly cantilevered from the actuator in operative association with a disk. The modified base mounting plate further individually mounts each load beam on an actuator for separate demounting of one without demounting of the other.

TECHNICAL FIELD

This application relates to computer hard disk drives and, moreparticularly, to load beam assemblies for such drives. The inventionfurther relates to improvements in the base or mounting plate portion ofload beam assemblies, i.e. improvements in the mounting plates whichdefine the base. The invention modifies such base mounting plates toenable the use of substitute load beams, including shorter and morerigid load beams in existing suspensions designed for other, longer loadbeams, with a gain in performance and a saving in design andmanufacturing cost. These modified bases may be used in newly designedsuspensions also.

The modified mounting plate bases further enable the individuatedmounting of multiple load beams onto single actuators using ordinarymounting techniques, such as swaging, but with the new result of readydemountability of one load beam without disruption of the mounting ofthe other. This feature of the invention allows the replacement of justone of a pair of load beams on a common actuator, where only one isdefective, for substantial savings in manufacturing time, yields andcosts.

BACKGROUND OF THE INVENTION

Computer hard drives include disks and sliders, the sliders beingsupported on suspensions to fly closely above the disk surface inprecisely positioned read/write relation. The positioning of the slider,assuming a constant actuator, is determined by the load beam assembly,this assembly comprising the load beam, the flexure and the slider, andthe mounting base which mounts the other load beam components to theactuator. Modification of the mounting plate in accordance with theteaching of this invention enables the separate mounting of load beamsto a common actuator and the cantilever suspension of a load beam from amounting plate extending beyond the actuator. In the latter case, arelatively shorter and stiffer load beam can be combined with acantilevered mounting plate as a base, and substitute for a longer, moreflexible load beam previously used in a given suspension. This gives again in performance while maintaining the precise positioning of theslider despite the use of a shorter load beam. The shorter load beamwould not ordinarily extend sufficiently to permit the requiredpositioning when substituted for the standard longer load beam.

SUMMARY OF THE INVENTION

It is accordingly an object of the invention to provide the means tomount a load beam assembly to an actuator for individual dismounting,whether or not cantilevered, and in certain cases to be supported frombeyond the actuator so as to have a relatively shorter load beam sufficefor a longer with increase in stiffness and no modification of theoverall suspension beyond changes in the load beam and its mounting. Itis another object to provide simple mechanical modification of the basemounting plate to enable individual demounting and make up for thechange in load beam dimensions. It is another object to provide asuspension design modified solely at the mounting plate-load beaminterconnection so that the suspension maintains its originalpositioning characteristic. A still further object is to provide novelmounting plates for load beams.

These and other objects of the invention to become apparent hereinafterare realized in a disk drive suspension mounting plate for mounting aload beam to an actuator in operative association with a disk, theactuator defining a mounting hole, the mounting plate defining a firstmounting means registerable with the actuator mounting hole andcooperating therewith to mount the mounting plate to the actuator, themounting means plate defining second mounting means cooperating with theload beam to mount the load beam on the mounting plate as the solesupport of the load beam in its said operative association. The actuatorcan further define a second mounting hole longitudinally spaced from thefirst mounting hole, the mounting plate mounting means being a firstmounting means and comprising an aperture having a wall deflectable intoengagement selectively with the first or second actuator mounting holeto mount the mounting plate to the actuator for sole supporting of theload beam correspondingly from the actuator first or second mountinghole. Additionally, the mounting plate can have a portion cantileveredfrom the actuator, the load beam being supported from that portion.

Accordingly, in one aspect, the invention provides a disk drivesuspension comprising an actuator having first and second load beamsmounted thereto for operative association with a disk, the actuatordefining first and second load beam mounting holes extending verticallyin a common plane and spaced along the longitudinal axis of theactuator, the first load beam being mounted to the actuator at the firstmounting hole, the second load beam being mounted to the actuator at thesecond mounting hole, the first and second load beams lying in thecommon vertical plane, whereby the first and second load beams areindividually separable from the actuator for demounting of one load beamwithout disturbing the mounting of the other.

In this and like embodiments, there is also included a first load beammounting plate mounting the first load beam to the actuator at the firstmounting hole, a second load beam mounting plate mounting the secondload beam to the actuator at the second mounting hole, and the first andsecond load beam mounting plates lie substantially parallel to eachother in the common vertical plane. Typically, the actuator has an endbracketed by the first and second load beams, first and second load beammounting plates being of different lengths to extend respectively to thefirst and second mounting holes from the actuator end, the second loadbeam mounting plate is apertured opposite the first load beam mountinghole and is free of mounting the second load beam at the first mountinghole, and the first and second mounting plates are swaged intoengagement with the first and second mounting holes respectively.

In a further embodiment, the invention provides in combination theforegoing actuator and a flexure and slider mounted on each of the loadbeams in operative association with a disk.

In a still further embodiment, the invention provides the method ofcarrying first and second load beams on a common actuator in operativeassociation with the disk of a disk drive suspension, includingproviding separate mounting holes spaced along the longitudinal axis ofthe actuator, and individually mounting the load beams with separatemounting plates to the actuator at the separate mounting holes forseparately demounting one of the load beams without disturbing the otherof the load beams.

In another embodiment, the invention provides a disk drive suspensionactuator defining a first mounting hole, a mounting plate mounted in themounting hole and having a portion thereof cantilevered from theactuator, the mounting plate defining in its cantilevered portion anaperture longitudinally spaced from the mounting hole, and a load beammounted in the cantilevered portion aperture for operative associationwith a disk at a distance from the actuator greater than the length ofthe load beam.

In this and like embodiments, typically, each of the actuator and theload beam partially overlap the mounting plate, the mounting platedefines a longitudinal extension of the actuator enabling a relativelytoo short load beam to be mounted in operative association with the diskin substitution for a relatively longer load beam without otherwisealtering the components of the disk drive suspension, the load beammounted on the mounting plate is torsionally stiffer than a load beam ofthe same overall length of the mounting plate and the load beam, themounting plate and the load beam are each swaged into engagement withtheir mounting holes and aperture respectively, and there is furtherincluded a flexure and slider mounted on the load beam in operativeassociation with a disk.

More particularly, the invention comprises in this embodiment a diskdrive suspension comprising an actuator defining a mounting hole, amounting plate mounted in the mounting hole and having a cantileveredportion extending from the actuator, the mounting plate defining anaperture and a load beam, flexure and slider assembly, the assembly loadbeam being mounted in the aperture for operative association of theslider with a disk at a distance from the actuator greater than thelength of the load beam.

In addition, the invention provides a disk drive suspension comprisingan assembly of an actuator, a load beam, a flexure and a slider, theslider being adapted to be supported in operative position opposite adisk, the load beam being of insufficient length to support the sliderin operative position when mounted on the actuator, and a mounting platecarried by the actuator and carrying the load beam, the mounting plateand load beam together having sufficient length to support the slider inits operative position.

The invention further contemplates provision of the method of supportingon an actuator a load beam flexure and slider assembly in operativeassociation with a disk where the load beam is insufficiently long,including mounting a mounting plate to an actuator in cantileveredrelation, and mounting the load beam, flexure and slider assembly to themounting plate at its cantilevered portion.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be further described in conjunction with the attacheddrawings in which:

FIG. 1 is a plan view of one embodiment of the invention mounting plateand disk drive suspension;

FIG. 2 is an exploded view thereof;

FIG. 3 is a view taken on line 3--3 in FIG. 1; and,

FIG. 4 is a view like FIG. 2 of another embodiment of the invention; and

FIG. 5 is a view in vertical section of the invention embodiment of FIG.4.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present suspension utilizes a novel mounting plate or base for aload beam enabling on the one hand the cantilever mounting of a shorter,more torsionally stiff load beam in a suspension designed for a longerload beam, and on the other hand enabling separately demountablemountings of upper and lower load beams on a common actuator. Theinvention mounting plate or load beam assembly base in each embodimentis a rigid element having a mounting hole to which the load beam isaffixed, as by swaging the periphery of a preformed hole in the loadbeam into engagement with the mounting hole. The mounting plate isitself mounted to the actuator by swaging a boss formed on the mountingplate into a receiving opening in the actuator.

With reference now to the drawings in detail, in FIGS. 1-3, disk drivesuspension mounting plate 10 mounts upper and/or lower (first or second)load beams 12, 13, 14 to an actuator 16 in operative association with adisk 17. The actuator 16 defines a mounting hole 18 inward of actuatorend 19. Mounting plate 10 defines a first mounting means 20 registerablewith the actuator mounting hole 18 and cooperable therewith to mount themounting plate to the actuator, as shown particularly in FIG. 3. Themounting plate 10 further defines a second mounting means 22 cooperablewith the load beam 12, 14 to mount the load beam on the mounting plateas the sole support of the load beam in its operative association withthe disk 17. The mounting plate first mounting means 20 comprises anaperture 26. Aperture 26 has a wall 27 formed by boss 28 deflectableinto engagement with the actuator mounting hole 18 to mount the mountingplate 10 to the actuator 16 for sole supporting of the load beams 12,13, 14 correspondingly from the actuator mounting hole. Additionally,the mounting plate 10 has a portion 32 cantilevered from the actuator16, the load beam 12, 13, 14 being supported from that portion forpurposes to appear.

With further reference to FIGS. 1-3, an embodiment is shown wherein theload beams 12, 13, 14 are relatively shorter than original design loadbeams. This may occur as a result of a load beam redesign within a givendisk drive suspension to make use of a shorter load beam, and there is acontinuing necessity or desirability to cantilever the load beam fromthe actuator. In this embodiment, mounting plate 10 is part of each ofthe overall disk drive suspensions 34 which further include actuator 16,a load beam assembly 38 comprising a slider 40, flexure 42 and a loadbeam, e.g. load beam 12, 13 or 14. Each load beam assembly 38 is mountedby its respective mounting plates 10 to the actuator 16 by swagingmounting plate boss 28 into actuator mounting hole 18, thereby arrangingthe assembly in operative association with the disk 17. Typically, onlyone mounting hole 18 is used for the upper and lower load beams 12, 13,14.

Accordingly, in the illustrated embodiment of FIGS. 1-3, actuator 16mounts mounting plate 10 in mounting hole 18. As shown, the mountingplate 10 has itself a cantilevered portion 32 projecting from theactuator 16. Mounting plate portion 32 has formed within it an aperture44 longitudinally spaced from the mounting hole 18 and defining secondmounting means 22 (FIG. 2). Load beams 12, 13 and 14 are mounted in thecantilevered portion aperture 44 for operative association with disk 17.The load beams 12, 13 and 14 are each of a given length which is lessthan the length they need to be should they have to be mounted to theactuator 16 directly. As shown, however, because of the interposition ofthe mounting plate 10, the load beams 12, 13 and 14 are positioned at adistance from the actuator 16 greater than the length of the load beam.

Other features of the present embodiment include the actuator 16 and theload beams 12, 13, 14 partially overlapping the mounting plate at 50, 51and 52 respectively, and the mounting plate 10 defining a longitudinalextension 54 of the actuator enabling a relatively too short load beam12, 13, and 14 to be mounted in operative association with the disk 17in substitution for a relatively longer load beam without otherwisealtering the components of the disk drive suspension. The shorter loadbeam 12, 13 and 14, per se, and when mounted on the mounting plate 10are each torsionally stiffer than a bodily unitary load beam of the sameoverall length of the mounting plate and the load beam, for higherperformance in use.

In the method aspects of this embodiment of the invention, actuator 16supports a load beam, flexure and slider assembly 38 in operativeassociation with a disk 17 where the load beam 12, 13 or 14 isinsufficiently long, by mounting mounting plate 10 to the actuator incantilevered relation, and mounting the load beam, flexure and sliderassembly 38 to the mounting plate at its cantilevered portion 32.

In a second embodiment of the invention, with reference to FIGS. 4 and5, wherein like parts bear like numerals plus 100, mounting plates 11,110 are secured to actuator 116, this time in a manner such that eachload beam 112, 113, is separately mounted to the actuator. Accordingly,actuator 116 has upper and lower first and second load beams 112, 113mounted thereto for operative association with disk 117. Actuator 116has a length appropriate to its purpose in fixing load beam 112, 113 tothe closer or the farther mounting opening 118, 21, respectively. Thefirst and second load beam mounting holes 118 and 21 extend verticallyand in a common plane and are spaced along the longitudinal axis of theactuator 116 at least a distance sufficient to permit separate insertionof the appropriate mounting plate boss 128 into the appropriate mountinghole . The first load beam 112 is mounted to the actuator 116 at thefirst mounting hole 118, the second load beam 113 is mounted to theactuator at the second mounting hole 21, as by swaging or otherwisesecuring the parts together. Separate swaging operations are carried outat each mounting point and the mounting of one load beam does not dependon simultaneous or sequential mounting of the other load beam. The firstand second load beams 112, 113 lie in the common vertical plane also.Being separately mounted, the first and second load beams 112, 113 areindividually separable from the actuator for demounting of one load beamwithout disturbing the mounting of the other. One or the other mountingplate 11, 110 is simply separated and the defective load beam released.A new load beam can be positioned and fastened without use of themounting hole of the good load beam. In the past, where two load beamswere mounted in a single hole, of FIG. 3, removal of the onenecessitated removal of the other or at least precluded mounting of areplacement load beam by ordinary means since the remaining load beamwas in place. Therefore, if one load beam tested defective both it andits mate across the mounting hole had to be changed out, even where thesecond load beam was not defective. This practice increases expense inmanufacture and lowers yield of good product, and the present inventionobviates the problem.

It will be noted that in the illustrated form of this embodiment thefirst and second load beam mounting plates 11, 110 lie substantiallyparallel to each other in the common vertical plane in which themounting holes 118, 21 lie. Also, actuator 116 end 119 is bracketed bythe load beams 112, 113. The first and second load beam mounting plates11, 110 are of different lengths to extend respectively to the first andsecond mounting holes 118, 21 from the actuator end 1 19. The secondload beam mounting plate 110 is apertured opposite the first load beammounting hole 118 but does not mount anything there, that is the plate110 is free of mounting anything where apertured opposite mounting hole118. Finally, the first and second load beam mounting plates 11, 110 areswaged into engagement with the first and second mounting holes 118, 21respectively.

As in the previous embodiment, the load beam assembly 134 may becombined in operative association with disk 117. There is furtherprovided the method of carrying first and second load beams 112, 113 ona common actuator 116 in operative association with a disk of a diskdrive suspension, including providing separate mounting holes 118, 21spaced along the longitudinal axis of the actuator 116, and individuallymounting the load beams to the actuator with separate mounting plates11, 110 at the separate mounting holes for separately demounting one ofthe load beams without disturbing the other of the load beams.

The specific design of the load beams, flexures, sliders and actuatorsis not narrowly critical as the present invention is applicable to manystyles of load beams, flexures, sliders, and actuators in disk drivesuspensions where there is need to have the load beams separatelydemountable or to substitute a shorter for a longer load beam withoutrevising the remainder of the suspension.

The invention thus provides a novel base mounting plate for disk drivesuspensions, and further provides a means to mount a load beam assemblyto an actuator for individual dismounting, whether or not cantilevered,and in certain cases to be supported from beyond the actuator so as tohave a relatively shorter load beam suffice for a longer one withincrease in stiffness and no modification of the overall suspensionbeyond changes in the load beam and its mounting. The invention requiresonly simple mechanical modification of the base mounting plate to enableindividual demounting and make up for the change in load beamdimensions. Modifications of the suspension design are made solely atthe mounting plate-load beam interconnection so that the suspensionmaintains its original positioning characteristic, but with improvedstiffness where the mounting plate cantilevers the load beam beyond theactuator end.

The foregoing objects of the invention are thus met.

I claim:
 1. A disk drive suspension comprising an actuator having firstand second load beams mounted thereto for operative association with adisk, and first and second mounting plates of shorter and longer lengthsrespectively, said actuator defining first and second mounting holesextending vertically in a common plane, said mounting holes beinglongitudinally spaced such that said first, shorter length mountingplate only reaches said first mounting hole, said first load beam beingmounted to said actuator at said first mounting hole by said firstmounting plate, said second load beam being mounted to said actuator atsaid second mounting hole by said second mounting plate, said first andsecond load beams lying in said common vertical plane, said first andsecond load beams being longitudinally offset in their respectivemountings, whereby said first and second load beams are individuallyseparable from said actuator or demounting Of one load beam from saidactuator without disturbing the mounting of the other.
 2. Disk drivesuspension according to claim 1, in which said actuator has an end, saidfirst and second load beam mounting plates in registration with saidactuator end extending respectively to said first and second mountingholes from said actuator end.
 3. Disk drive suspension according toclaim 2, in which said second load beam mounting plate is aperturedopposite said actuator first load beam mounting hole and is free ofmounting said second load beam at said first mounting hole.
 4. Diskdrive suspension actuator according to claim 3, in which said first andsecond mounting plates are swaged into engagement with said first andsecond mounting holes respectively.
 5. Disk drive suspension accordingto claim 1, said suspension further including a flexure and slidermounted on each of said first and second load beams in operativeassociation with a disk.